#app {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.top {
  width: 100%;
  height: 340px;
  background-image: url("../images/red.png");
  background-size: 100% 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
}

header {
  width: 1200px;
  height: 54px;
  background-color: aqua;
}

.search {
  width: 1200px;
  height: 178px;
}

.buy_car {
  width: 1200px;
  height: 273px;
  background-color: #fff;
  border: 1px solid #000;
  border-radius: 10px;
  margin-top: -108px;
}

.hot_car {
  width: 1200px;
  background-color: #fff;
  margin-top: 70px;
}
h2 {
  font-size: 24px;
  margin: 26px 0;
}

ul {
  width: 100%;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
}

li {
  width: 286px;
  height: 277px;
  border: 1px solid #000;
  margin-top: 30px;
}